Mining-machine.



" 543531 Patented 'Feb. I3, I900. C. ROBINSON.

MINING MACHINE. (Application filed J'Izly 1'7, 1894. Renewed July 17, 1899.)

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(No Model.)

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Patented Feb. l3, I900.

C. ROBINSON.

MINING MACHINE.

(Application filed July 17, 1894. Renewed July 17, 1899.)

(No Model.)

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Patented Feb. I3, I900.

C ROBINSON MINING MACHINE.

(App! at nfil dJuly 17 1894 Rn VI dJuly 1" h8 9) (No Model.)

UNITED STATES PATENT OFFICE.

CYRUS ROBINSON, OF COLUMBUS, OHIO.

MINING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 643,537, dated February 13, 1900.

Application filed July 17, 1894:- Renewed July 17, 1899 Serial NO. 724,138. (N model.)

To (ZZZ w/wm it may concern:

Be it known that I, CYRUS ROBINSON, a subj ect of the Queen of Great Britain, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Mining-Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Figure 1 is a plan view of a mining-machine embodying myimprovements. Fig. 2 is a side elevation. Fig. 3 is a longitudinal section taken centrally, on an enlarged scale, of some of the parts of the machine. Fig. 4 is a rear elevation. Fig. 5 is a cross-section on the line a: or of Fig. 1 looking rearward. Figs. 6, 7, 8, and 9 are respectively a plan view, a front edge view, a rear edge view, and a central longitudinal section of the carriage-plate. Fig. 10 is a transverse section of the bed, the carriage-bars, the carriage-plate, the feedshaft, and the nut. Fig. 11 is a longitudinal section and a cross-section of the screw-shaft, the nut, and one of the clutch-plates. Fig. 12 is a rear view and a top view of the rear cross-bar of the bed. Fig. 13 shows similar views of the forward cross bars. Fig. 14 shows in plan and in side view the device for moving the rear sprocket-wheel of the cleaning-chain. Fig. 15 is a side view and a section of one of the shoes for the cutter-bar. Fig. 16 is a detail view of a portion of the carriage adapted to engage the clutch Q shown in Fig. 13.

The improvements to which the present invention relates are illustrated as being embodied in a machine of the class now commonly in use having a bed, a sliding carriage, and a cutting apparatus at the front end of the carriage.

A A indicate the longitudinal bed-bars, they having on their inner faces grooves or channels a to receive the main side bars B of the carriage. The bed-bars are joined together at points intermediate of their ends by cross brace-bars O, which are carried from the top edges of the bars A down the outer faces thereof and then across from one to the other. The brace at the rear end is carried across the top as well as the bottom, as shown at O The main longitudinal bars B of the carriage support the cutting apparatus as well as the motor or engine and the gearing. These carriage-bars 'B may be joined and strengthened by transverse bars, which may be joined by longitudinal braces, if desired. At the front ends the bars B have secured to them shoes F. These shoes are each formed in two sections ff. I have succeeded in making the front part of these machines stronger than they have been heretofore made by so arranging the shoes relative to the sliding bars that I can extend the two bed-bars considerably farther forward, whereby the oarriage is braced and supported more firmly than in the earlier machines. To accomplish this, I recess the shoes, as at f and then place them on the inside of the carriagebars B, or, in other words, put them in a position exactly the opposite of that which they usually occupy, as is clearly shown in Figs. 1 and 15. It will be seen that the bar B can be supported throughout its entire length practically in the channel of the bed-bar, so that not only is said bar held firmly, but, moreover, the machine can beconsiderably shortened, as the carriage can come back a correspondingly greater distance.

Each shoe is formed with an inside recess f and an outside recess f there being a forward-projecting web f between them. This web has a bearing-aperture F to receive the cutter-bar H. The latter is reduced-at h and is fitted in a bushing G, which in turn is fitted in the aperture F and has a flange g, which bears against the web. f and holds the cutterbar properly in place. The shoe is also provided with an aperture at i, in which is mount ed the cleaner-chain shaft I.

The cutter-bar H and the shaft I are driven by chains J and K, which extend back toward the rear end of the carriage. The cleanerchain shaft I has chains is outside of the bedbars and extending backward, as shown.

L indicates the carriage plate or platform for supporting the gearing, the shafting, and the motor or engine. It is formed with an open center and has the front and rear bars L L and the side bars L Its top flanges Z rest upon the carriage-bars B; but it has vertical flanges Z, which fit inside of 'said bars, said flanges Z being slotted at Z so that clampingbolts can be used which will permit adjustment of the carriage-plate and fasten it in different positions. The carriage-plate can be pushed backward by adjusting-screws Z engaging with bracket-nuts l. The carriageplate L is also cast with an upward-projecting web M on each side, each web having at its upper end a laterally-extending flange m, in the upper surface of which are formed two half-boxes at m for shaft-mountings. In these are mounted the two shafts N and 0, they being geared together by wheels N and 0, related so as to properly reduce the speed of the shaft 0, and the latter has the wheel or sprocket teeth 0 for driving chain J and a wheel or teeth at o for driving the cleanershaft chain K. The shaft N has also the wheel N which engages with the pinion P on the armature-shaft P. Then the armature is rotating, it will be seen that the cutterbar will be rotated through the above-described mechanism with a speed depending upon the ratios of the gearing at P N and at N 0'.

When the bar is rotating, it and the carriage are advanced as follows: The shaft 0 has a worm 0, which drives a worm-wheel Q. S is a threaded shaft mounted on the bed, it having bearings on the rear cross-bar O and the front cross-bar at C The wheel Q is mounted on this bar loosely in relation thereto, it being supported on an intermediate nut S. The latter also supports a clutch or section of a clutch at Q, which is feathered or splined at q, so as to always rotate with the nut, the Wheel Q depending upon the clutch for engagement with the nut. \Vhen the abovedescribed gearing and shafting, including the worm-wheel Q, are in motion, the clutch Q can be moved into engagement with wheel Q by a shifting mechanism comprising a ring T, links 2, and a lever T, pivoted at i to the carriage-plate. Vhen the clutch Q is disengaged from wheel Q, the advance of the carriage is stopped, and it can then be receded as follows: R is a worm-Wheel also mounted loosely on the nut S. Poweris taken from this wheel to the threaded shaft S through another clutch or clutch-section R. This clutch is mounted on a sleeve R and is connected thereto by a gib or spline r. The sleeve R is also splined to the threaded bar S. Preferably the spline r is arranged to connect the three parts R, R and S, the sleeve R being slotted, so as to permit a part of the gib or spline r to extend through it upward. The sleeve acts to support the clutch away from the threads of bar S and prevents injury thereto. It will be seen that when wheel R and clutch R are in engagement (if clutch Q and wheel Q are disengaged) the shaft S will be rotated, and if at such times the nut S be held against rotation the bar S will compel the carriage to move backward. It will also be seen that when wheel Q and clutch Q are in engagement it is necessary to prevent the rotation of the bar S in order to effect the forward feed of the carriage. The two parts, the nut and bar S, are thusintermittingly made non-rotary as follows: The carriage-plate is at the front formed with more or less of a ring in one or more parts surrounding the bar S, as shown at L L Preferably the upper part L is cast integral with the carriage-plate and the lower part L is of the nature of a cap-piece bolted to the upper. The rear face of this ring or expansion is provided with teeth or projections, preferably spring-actuated fingers l. The front end of the clutch Q is formed with a series of ratchet-like teeth adapted to engage with these said fingers Z when the clutch is rotating in one direction, but to move past them when rotating in the opposite direction. The opposite clutch R can be engaged in a similar manner. The carriage-plate L has a ring-like vertical expansion at the rear edge having the upper part L and the cap-piece L There are spring-fingers at l and ratchetteeth at '1', adapted to'engage therewith. The clutch R is moved by a ring T ,which is also connected to the aforesaid links t and the operating-lever T.

The parts above described are so related in their positions that when the clutch-section R is in engagement with its wheel R (at which time the shaft or bar S will be rotated) the clutch-section Q is away from wheel Q and is engaged with the pin Z", and consequently is prevented from rotating, and, be ing feathered to the nut, the latter is also looked against rotation, and hence the rotating bar S will compel the carriage to recede. When the lever T is moved so as to draw clutch Q into engagement with wheel Q, it simultaneously moves clutch R away from .wheel R and into engagement with pins 1 the results of which are that the nut is released from the locked position and the clutch R and shaft S are locked against rotation, and if the gearing is in motion the nut will revolve and cause the carriage to advance.

posing hardened plates u and u, the former being made rigid with the carriage-plate, as by pin at if, and the latter being secured to the nut, as by key or pin a", and nut-periph- IIO cry, being shouldered at 11, to receive this plate 11. securely. The plates u and to have circular groove, in which are placed the balls U. When the rotary nut is pressing forward against the carriage, the pressure is taken by the balls U, and the friction is reduced thereby to a minimum. The frictional resistance to the threaded bar S is also reduced by ballbearings. The rear end of this bar S passes through a bearing plate or box V, which is secured to the rear cross-brace C of the bed. It has an inclosed chamber 1), the front wall having a relatively-small aperture for the bar S and the rear wall 1; having a somewhat larger aperture. The bar S is surrounded by a hardened plate 10, secured by a key to to the front wall, and at to there is an opposing plate pinned or otherwise fastened to the bar S. The plates w and w are grooved annularly and provided with a series of antifriction-balls \V. The rear end of bar S is shouldered down and threaded and provided with nuts at V, which bear against and adjust a ring or plate V for regulating the position of the antifriction-balls W.

It will be seen that when the nut Q is stationary and bar S is rotating it will draw forward the plate 20 and push backward on the carriage through the nut, and the strain or resistance from the forward draft is reduced to a minimum by means of the balls W.

The front end of the screw-bar S is not held rigidly, but is supported by a standard X with sufficient looseness, which permits it to play more or less vertically (forward and back) and horizontally, and as a result there is no strain exerted upon said front end or upon the bed-frame at that point, the strain being taken entirely by the rear brace. As shown in Figs. 1, 2, and 3, this standard X is preferably provided at its upper end with a sleevelike support X, which fits on a cross bar or rod X supported at its ends in upwardly-extending ears 0 on the bed, said rod to avoid confusion of parts being shown in dotted lines in Fig. 1. If desired, the front jack X may be mounted on the said transverse rod X While a motor of any desired sort may be used, I prefer to employ one substantially such as shown. It comprises an inclosed armature and exterior shell or box like field. The latter is made in two main portions Y Y. The part Y is cast with down ward-extending webs Y each terminating at its lower end in outwardly-extending flanges Y, adapted to rest on the webs M and flanges m thereof and having two half-boxes or bearing-caps fitting upon the bearings at m and serving to hold shafts N and O in place, the number of parts and the amount of metal for these purposes being reduced to a minimum. The parts Y Y of the field-magnet or box are fastened together by bolts at Y. This shell-like field is divisable on a diagonal plane in such way that the upper part can be readily removed. or opened to permit access to the interior and allow the removal of the armature or other parts. The boxes Y are divided on the same plane, and it will be seen that when the upper part is opened the armature can be taken out by lifting it on inclined lines without danger of it interfering with or striking any of the stationary parts.

The above-described chains is are outside of the bed for drawing the cuttings back and are supported at their rear ends on sprocketwheels is, and these wheels are mounted on sliding supports 1 0 there being guides K secured to the outer sides of the bed-bars to hold the supports and the wheels in place.

K are overhanging arms secured to the carriage-plate and adapted to engage loosely with fingers k projecting from the wheel-holders 10 When the carriage is moving forward, the wheel is and its holder are advanced by the tension of the chain, and when it moves backward the arms K push the sliding holders it? toward the rear.

What I claim is- 1. In a mining-machine, the combination of a stationary bed, the carriage mounted on the bed, the motor mounted on the carriage, the cutting apparatus on the carriage, a carriagemoving mechanism having two intermittently-rotary members, one mounted in bearings on and moving with the carriage and the other mounted in hearings on the bed, and means actuated by the motor simultaneously with the cutting apparatus and mounted on the carriage for driving either of said rotary members of the carriage-moving mechanism; substantially as set forth.

2. In a mining-machine, the combination of the bed, the carriage on the bed, the motor on and traveling with the carriage, the cutting apparatus on the carriage, the carriage-mow ing mechanism, consisting of a nut mounted on the carriage and a threaded shaft on the bed, two differently-speeded trains of gears mounted on the carriage and actuated by the said motor and adapted to be connected respectively with the said nut and the said threaded shaft; substantially as set forth.

3. In a mining-machine, the combination with the bed, the carriage mounted on the bed, the cutting apparatus on the carriage, the motor on the carriage, the carriage-moving mechanism consisting of a rotary nut and a threaded shaft, one mounted on the carriage and the other on the bed, and two differentlyspeeded trains of gearing, both actuated by the motor simultaneously with the cutters for alternately rotating said nut and shaft in the same direction; substantially as set forth.

4. In a mining-machine, the combination with the bed, the carriage, the cutting apparatus on the carriage and the motor on the carriage, of a carriagemoving mechanism having two alternately-rotating mutually-engaging members, one mounted on the carriage and the other mounted on the bed, and two continuously-rotatin g wheels actuated by the motor simultaneously with the cutters for driving the said members of the carriage-mow ing mechanism; substantially as set forth.

5. In a mining-machine, the combination of the bed, the carriage, the cutting apparatus, the carriage moving mechanism and two loosely-mounted wheels rotating continuously in the same direction about the axis of the carriage-moving mechanism, and means for connecting said wheels alternately with the carriage-moving mechanism; substantiallyas set forth.

6. In a mining-machine, the combination with the bed, the carriage, the cutting apparatus, and the engine or motor, of the carriagemoving mechanism, the two looselymouuted wheels rotating continuously in the same direction for actuating the carriage-m oving mechanism, and the two driving-shafts, each geared to one of said wheels and moving continuously in opposite directions; substantially as set forth.

7. The combination with the carriage-moving mechanism, having the alternately-rotating nut and screw-shaft, the two wheels mounted loosely on the nut, and means for alternately imparting rotation from said wheels to said nut and said screw-shaft; substantially as set forth.

8. The combination with the bed, the carriage mounted on the bed and carrying the cutting apparatus, and the carriage-moving mechanism, consisting of a nut and screw, of the two wheels loosely mounted on the nut, continuously-revolving power devices geared to said wheels, a clutch for connecting one of the said loose wheels with the screw, another clutch splined to the nut and adapted to engage with the other loose wheel, and means on the carriage for preventing rotation of the nut and clutch thereon in one direction; substantially as set forth.

9. In a mining-machine, the combination with the bed, the carriage, the cutting apparatus and the carriage-moving mechanism, consisting of a nut and threaded shaft, of two wheels loosely mounted on the nut and geared to constantly-revolving power devices on the carriage, a clutch splined to the nut and adapted to engage with one of said loosely-mounted wheels, a clutch splined to the threaded shaft and adapted to engage with the other loose wheel, and means for preventing the last-said clutch from rotating in one direction; substantially as set forth.

10. In a mining-machine, the combination with the bed, the carriage on the bed, the cutting apparatus, and the carriage moving mechanism, consisting of a nut and a threaded shaft, of two loosely-mounted wheels geared to constantly-acting power devices, a clutch splined to the nut and adapted to engage one of the said loosely-mounted wheels, means for preventing the rotation of said clutch in one direction, another clutch connected with the threaded shaft and adapted to engage with the other of said loosely-mounted wheels,

means for preventing rotation of the last-said clutch in one direction, and means for simultaneously connecting one of said clutches with its coactin g wheel and disconnecting the other from its wheel; substantially as set forth.

11. The combination with the carriage-moving mechanism, having a nut and screw, and constantly-acting power devices, of a clutch splined to the nut and having on one face means for engaging one of said wheels and a series of teeth on its other face, a stationary disk provided with fingers or projections adapted to engage with the teeth on the clutch and prevent rotation thereof and of the nut in one direction, another clutch secured on the screw and adapted to engage with the other loose wheel, and means for simultaneously moving one clutch into engagement with its coacting wheel, and the other clutch out of engagement with its wheel; substantially as set forth.

12. In a mining-machine, the combination of the bed, a carriage on the bed, cutting apparatus on the carriage, a motor on the carriage, carriage-moving mechanism, consisting of two intermittently-acting rotary members, continuously-acting power devices driven by the motor and connected to the cutting apparatus, and means for alternately connecting the members of the carriage-moving mechanism with the cutter-driving power devices; substantially as set forth.

13. In a mining-machine, the combination of a bed, a carriage on the bed, cutting apparatus on the carriage, an engine or motor, mechanism for moving the carriage on the bed consisting of two rotary members, one mounted on the bed and one mounted on the carriage, continuously-acting power devices on the carriage, two loose wheels geared to said power devices and rotating in the same direction, means for connecting one of said wheels with the member of the carriage-movin g mechanism on the carriage, and means for connecting the other wheel with the member of the carriage-moving mechanism on the bed when the other wheel is disengaged from such mechanism; substantially as set forth.

14. In a mining-machine, the combination of a bed, a carriage on the bed, cutting apparatus on the carriage, a motor or engine, a prime powershaft, a shaft extending parallel to the prime shaft and geared to the cutting apparatus, carriage-moving mechanism, comprising a member extending longitudinally of the bed, and a member on the carriage adapted to engage with and move longitudinally of the member on the bed, two loose wheels mounted on an axis transverse to the axis of said parallel shafts and con nected with the power devices on the carriage to rotate continuously in the same direction and means for alternately connecting said wheels with the carriage-moving mechanism for moving the carriage forward and back on the bed; substantially as set forth.

15. The combination with the bed, the carmotor simultaneously with the cutters for driving the said members of the carriage-moving mechanism; substantially as set forth.

5. In a mining-machine, the combination of the bed, the carriage, the cutting apparatus, the carriage moving mechanism and two loosely-mounted wheels rotating continuously in the same direction about the axis of the carriage-moving mechanism, and means for connecting said wheels alternately with the carriage-moving mechanism substantiallyas set forth.

'6. In a mining-machine, the combination with the bed, the carriage, the cutting apparatus, and the engine or motor, of the carriage-moving mechanism, the two looselymounted wheels rotating continuously in the same direction for actuating the carriage-moving mechanism, and the two driving-shafts, each geared to one of said wheels and moving continuously in opposite directions; substantially as set forth.

7. The combination with the carriage-moving mechanism, having the alternately-rotating nut and screw-shaft, the two wheels mounted loosely on the nut, and means for alternately imparting rotation from said wheels to said nut and said screw-shaft; substantially as set forth.

8. The combination with the bed, the carriage mounted on the bed and carrying the cutting apparatus, and the carriage-moving mechanism, consisting of a nut and screw, of the two wheels loosely mounted on the nut, continuously-revolving power devices geared to said wheels, a clutch for connecting one of the said loose wheels with the screw, another clutch splined to the nut and adapted to engage with the other loose wheel, and means on the carriage for preventing rotation of the nut and clutch thereon in one direction; substantially as set forth.

9. In a mining-machine, the combination with the bed, the carriage, the cutting apparatus and the carriage-moving mechanism, consisting of a nut and threaded shaft, of two wheels loosely mounted on the nut and geared to constantly-revolving power devices on the carriage, a clutch splined to the n at and adapted to engage with one of said loosely-mounted wheels, a clutch splined to the threaded shaft and adapted to engage with, the other loose Wheel, and means for preventing the last-said clutch from rotating in one direction; substantially as set forth.

10. In' a mining-machine, the combination with the bed, the carriage on the bed, the cutting apparatus, and the carriage moving mechanism, consisting of a nut and a threaded shaft, of two loosely-mounted wheels geared to constantly-acting power devices, a clutch splined to the nut and adapted to engage one of the said loosely-mounted wheels, means for preventing the rotation of said clutch in one direction, another clutch connected with the threaded shaft and adapted to engage with the other of said loosely-mounted wheels,

means for preventing rotation of the last-said clutch in one direction, and means for simultaneously connecting one of said clutches with its coacting wheel and disconnecting the other from its wheel; substantiallyas set forth.

11. The combination with the carriage-moving mechanism, having a nut and screw, and constantly-acting power devices, of a clutch splined to the nut and having on one face means for engaging one of said wheels and a series of teeth on its other face, a stationary disk provided with fingers or projections adapted to engage with the teeth on the clutch and prevent rotation thereof and of the nut in one direction, another clutch secured on the screw and adapted to engage with the other loose wheel, and means for simultaneously moving one clutch into engagement with its coacting wheel, and the other clutch out of engagement with its wheel; substantially as set forth.

12. In a mining-machine, the combination of the bed, a carriage on the bed, cutting apparatus on the carriage, a motor on the carriage, carriage-moving'mechanism, consisting of two intermittently-acting rotary members, continuously-acting power devices driven by the motor and connected to the cutting apparatus, and means for alternately connecting the members of the carriage-moving mechanism with the cutter-driving power devices; substantially as set forth.

13. In a mining-machine, the combination of a bed, a carriage on the bed, cutting apparatus on the carriage, an engine or motor, mechanism for moving the carriage on the bed consisting of two rotary members, one mounted on the bed and one mounted on the carriage, continuously-acting power devices on the carriage, two loose wheels geared to said power devices and rotating in the same direction, means for connecting one of said wheels with. the member of the carriage-movin g mechanism on the carriage, and means for connecting the other wheel with the member of the carriage-moving mechanism on the bed when the other wheel is disengaged from such mechanism; substantially as set forth.

14. In a mining-machine, the combination of a bed, a carriage on the bed, cutting apparatus on the carriage, a motor or engine, a prime power-shaft, a shaft extending parallel to the prime shaft and geared to the cutting apparatus, carriage-moving mechanism, comprising a member extending longitudinally of the bed, and a member on the carriage adapted to engage with and move longitudinally of the member on the bed, two loose wheels mounted on an axis transverse IIO to the axis of said parallel shafts and con- 15. The combination with the bed, the carery, being shouldered at n to receive this plate it securely. The plates u and u have circu lar groove, in which are placed the balls U. When the rotary nut is pressing forward against the carriage, the pressure is taken by the balls U, and the friction is reduced thereby to a minimum. The frictional resistance to the threaded bar S is also reduced by ballbearings. The rear end of this bar S passes through a bearing plate or box V, which is secured to the rear cross-brace O of the bed. It has an inclosed chamber v, the front wall having a relativelysm all aperture for the bar S and the rear wall 1; .having a somewhat larger aperture. The bar S is surrounded by a hardened plate 10, secured by a key 4.0 to the front wall, and at w there is an opposing plate pinned or otherwise fastened to the bar S. The plates to and w are grooved annularly and provided with a series of antifriction-balls W'. The rear end of bar S is shouldered down and threaded and provided with nuts at V, which bear against and adjust a ring or plate V for regulating the position of the antifrict-ion-balls V.

It will be seen that when the nut Q is stationary and bar S is rotating it will draw forward the plate 10 and push backward on the carriage through the nut, and the strain or resistance from the forward draft is reduced to a minimum by means of the balls W.

The front end of the screw-bar S is not held rigidly, but is supported by a standard X with sufficient looseness, which permits it to play more or less vertically(forward and back) and horizontally, and as a result there is no strain exerted upon said front end or upon the bed-frame at that point, the strain being taken entirely by the rear brace. As shown in Figs. 1, 2, and 3, this standard X is preferably provided at its upper end with a sleevelike support X, which fits on a cross bar or rod X supported at its ends in' upwardly-extending ears 0 on the bed, said rod to avoid confusion of parts being shown in dotted lines in Fig. 1. If desired, the front jack X may be mounted on the said transverse rod X While a motor of any desired sort may be used,Iprefer to employone substantiallysuch as shown. It comprises an inclosed armature and exterior shell or box like field. The latter is made in two main portions Y Y. The part Y is cast with downward-extending webs Y each terminating at its lower end in outwardly-extending flanges Y, adapted to rest on the webs M and flanges m thereof and having two half-boxes or bearing-caps fitting upon the bearings at m and serving to hold shafts N and O in place, the number of parts and the amount of metal for these purposes being reduced to a minimum. The parts Y Y of the field-magnet or box are fastened together by bolts at Y This shell-like field is divisable on a diagonal plane in such way'that the upper part can be readily removed or opened to permit access to the interior and allow the removal of the armature or other parts. The boxes Y are divided on the same plane, and it will be seen that when the upper part is opened the armature can be taken out by lifting it on inclined lines without danger of it interfering with or striking any of the stationary parts.

The above-described chains are outside of the bed for drawing the cuttings back and are supported at their rear ends on sprocket wheels 7t, and these wheels are mounted on sliding supports 70*, there being guides K secured to the outer sides of the bed-bars to hold the supports and the wheels in place.

K are overhanging arms secured to the carriage-plate and adapted to engage loosely with fingers 70 projecting from the wheel-holders 70 When the carriage is moving forward, the wheel 76 and its holder 70 are advanced by the tension of the chain, and when it moves backward the arms K push the sliding holders 70 toward the rear.

Vhat I claim is 1. In a mining-machine, the combination of a stationary bed, the carriage mounted on the bed, the motor mounted on the carriage, the cutting apparatus on the carriage, a carriagemoving mechanism having two intermittently-rotary members, one mounted in bearings on and moving with the carriage and the other mounted in bearings on the bed, and means actuated by the motor simultaneously with the cutting apparatus and mounted on the carriage for driving either of said rotary members of the carriage-moving mechanism substantially as set forth.

2. In a mining-machine, the combination of the bed, the carriage on the bed, the motor on and traveling with the carriage, the cutting apparatus on the carriage, the carriage-moving mechanism, consisting of a nut mounted on the carriage and a threaded shaft on the bed, two difierently-speeded trains of gears mounted on the carriage and actuated by the said motor and adapted to be connected respectively with the said nut and the said threaded shaft; substantially as set forth.

3. In a mining-machine, the combination with the bed, the carriage mounted on the bed, the cutting apparatus on the carriage, the motor on the carriage, the carriage-moving mechanism consisting of a rotary nut and a threaded shaft, one mounted on the carriage and the other on the bed, and two differentlyspeeded trains of gearing, both actuated by the motor simultaneously with the cutters for alternately rotating said nut and shaft in the same direction; substantially as set forth.

i. In a mining-machine, the combination with the bed, the carriage, the cutting apparatus on the carriage and the motor on the carriage, of a carriagemoving mechanism having two alternately-rotating mutually-engaging members, one mounted on the carriage and the other mounted on the bed, and two continuous] y-rotatin g wheels actuated by the riage, the nut, and the feed-screw of the yieldchains, the guides outside of the bed for said ing support on the bed for the front end of support and the overhanging arms for moving the feed-screw; substantially as set forth. the said supports on the guides, substantially 16. The combination of the bed,the carriage, as set forth. 1 5

5 the cuttingapparatus,and the cleaner-chains, In testimony whereof I affix my signature 7c, of the sprocket-wheels which support the in presence of two witnesses. chains and the guides for said wheels outside of the bed; substantially as setforth. CYRUS ROBINSON 17. The combination of the bed,the carriage,

10 the cutting apparatus, the outside cleanerchains, the sliding support for the cleaner- Witnesses:

H. H. 31.1%, LOUIS G. ADDISON. 

